Test automation encompasses all activities to automate various steps in the overall testing process including automation of test management, test generation, or test execution. The standardized Testing and Test Control Notation (TTCN-3) addresses selected challenges by defining a test specification language and a test system architecture that enables the implementation and execution of TTCN-3 test suites. Over the years, the standard has continuously being maintained and evolved. For example, concepts for static test configurations or for advanced parameterization and typing have been defined. The paper reviews the history and current status of TTCN-3 and concludes by giving an overview on recent extensions of TTCN-3 and future plans.